x64 Linux Shellcode
http://zerosum0x0.blogspot.com/2014/12/thoughts-on-slae64-certification.html
x64 Linux reverse TCP connect shellcode (75 to 83 bytes)
https://zerosum0x0.blogspot.com/2014/12/x64-linux-reverse-tcp-connect-shellcode.html
SLAE64 - 1360
Usage of shellbuild.py:
root@kali:~/SLAE64/reverseshell# python ../shellbuild.py -x 64 reverseshell.asm